Color Change Garnet Value, Price, and Jewelry Information
Any stone that changes color under different types of light is a rare treat for collectors. Color change garnets show the widest range of transformations…
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Gemstone Treatment Codes
The AGTA has proposed the use of gemstone treatment codes to promote disclosure and a common language for these procedures. Learn what these codes…
How Can Gem Buyers Protect Themselves from Fraud?
How can gem buyers avoid undisclosed gem treatments and substitutions? Learn why it’s best to deal with expert gem cutters rather than commercial…
Identifying Garnets Simplified
Identifying garnets by species is complicated. Learn how to use refractive index, hue, and absorption spectrum readings to simply the separation…
Is an SI Clarity Diamond a Good Deal?
Clarity grades are the most confusing part of diamond engagement ring buying. See what an SI clarity diamond looks like and learn how to pick the…
Destructive Gemstone Tests: Dye Testing
Gemologists can use dye testing to determine if a gemstone has been dyed to alter its color. Learn how to perform this procedure safely here.
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